<form ng-submit="home.update">
    <p>The ID is {{home.greeting.id}}</p>
    <div class="form-group">
        <label for="content">content:</label>
        <input type="text" class="form-control" id="content" name="content"
               ng-model="home.greeting.content">
    </div>
    <button type="submit" class="btn btn-primary">submit</button>
</form>
